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On Friday, 24 June 2016, 9:15, Eugen Block <eblock at nde.ag> wrote:
>> Make sure nova is using the noop driver.

> I'm trying to use ceilometer, in that case the docs say to use  
> messagingv2 driver, so that's what I did. And until two weeks ago it  
> worked just fine, I had no networking issues.



Your iptables output is showing entries from both nova-compute and neutron. If you are using the Neutron API for security groups, then I think you need firewall_driver=nova.virt.firewall.NoopFirewallDriver in nova.conf - that's what devstack does.